British Royal Navy, French Navy, Spanish Navy, the War of the Third Coalition of the Napoleonic Wars, Admiral Lord Nelson, HMS Victory, Admiral Pierre de Villeneuve, Cape Trafalgar, Captain Lewis Stratford Tollemache Halliday, Royal Marines Light Infantry, troops, soldiersBackground: Marines commemorate the Battle of Trafalgar by trooping the colour at Plymouth Barracks, and General Sir Lewis Halliday takes the salute